Sigma also made 100-300 f/4 lens which back in the day was one of the good zoom lenses that Sigma made.lol said:Making some assumptions from image of the rear lens cap and front, I estimate it could have a 72mm filter thread. I don't think there is quite the size to go to 77mm but of course I could be wrong. Anyone else want to have a go?
Sticking to 72mm filter, that would allow up to 200mm f/2.8, but that is nothing new. If they use a bit of rounding maybe 150mm f/2. That would certainly be different to have a zoom ending there.
I'll stick my neck out in a different direction. Where does it say it has to be faster than f/2.8? How about something like a xx-300mm f/4.0 lens? Sigma already do the 120-300 f/2.8 in that ball park, but that is really heavy and not particularly affordable in absolute terms. Everyone else does f/5.6 or slower 70-300 class lenses. Having a f/4 zoom I believe would would be new in that length range and would really get my interest. Not that I need another zoom covering 300mm+ as I have 3 of the things already.
The next focal length up would be 400mm f/5.6 but that's been done many times.
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